Sony has updated the Xperia SP official software support page with Android 4.3 Jelly Bean as the latest available firmware that can now be downloaded using a computer.

Sony Mobile is now seeding the official Android 4.3 Jelly Bean update for Xperia SP to various owners around the world after its initial release in Australia. The new firmware has a build version 12.1.A.0.266 running Android 4.3 Jelly Bean for Xperia SP C5303 LTE variant in Malaysia, Australia under Vodafone, United Kingdom, Greece, Central Europe, Netherlands, Bulgaria and the Philippines.

Owners of the mid-range smartphone may download the Android 4.3 update via Sony PC Companion for Windows PC but not on Windows 8 64-bit machines, Sony Bridge for Mac and Sony Update Service software. No Over-the-Air is available for this firmware yet and will continue to seed for owners in other regions as well.

Android 4.3 Change Logs

Sony Mobile also released the change logs regarding the latest firmware version 12.1.A.0.266 for Xperia SP and added several features on top of Android 4.3 Jelly Bean.

10. Revamped App menu UI with swiping from left shortcuts of Play Store and Sony Select

11. New user interface based on the same Android 4.3 Jelly Bean from other Xperia devices

12. Updated Xperia Home launcher

13. Enhanced STAMINA mode power manager

14. Lock screen shortcuts updated

15. Some icons have been changed

16. One-handed keyboard

Future Update

Unfortunately, Sony Mobile is now reconsidering Android 4.4 KitKat update for Xperia SP just like in the case of Xperia T and V. Based on support page, Sony tagged the device with "under investigation" to get future updates with Android 4.4 firmware version.